Improvement in saw-hangings



NVPETERS. PHDYWLITHOGRAPMER. WASHINGTON, D. Q.

p tion.

y in fig.2. u V y j Directly under the clamping-jaws the casting A is cored out to receive the follower d, which is retained SYLVESTERG. MASON, OF ROCHESTER, NEW YORK.

Letters Patent lira. 104,613, lated Junc 21, 1870.

IMPROVEMENT IN saw-HANGINGS.

Mar-( d The` Schedule refe're to in tl'ese Letters Patent and making part of the same all 'whom it may concern v i. j Be it known `that I, SYLVESTER G. MASON, of Rochester, in the county of Monroe, and State of New V "York, haveinvented a new and useful J ig-saw Clamp;

and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to. the accompanying drawingr making part of this specification, in which-- t j i Figureil is averticalcentral section of my inven- Figure 2 isa transverse section, taken in the plane ofthe dotted linea; in fig. 1. f

i The object of my invention (the nature of which will` be nnderstoodlbyreference to thedrawingand specification) is toprovide a means of quicklyv attaching or detaching a jgf'sawtoorfrom the drivingcross-head. To enable others to make and use my invention, I will describe its construction and operation.

. To the cross-head of` an ordinary jig-saw I rivet or` i otherwise securely attach the casting-A, which is cored out to receive the clamping device.

The jaws b, made of a `suitable lmctal, are wedgeshaped, as shown in fig. 2, and are tted to slide in a` vertical tapering recess provided in thecasting Al As the jaws are pushed upward in this recess, they l are forced to ciampthe saw C between them, as seen in contact with the jaws bythe spring i.

p The lower inner edge of the clamping-jaws are rabbeted out, as shown at fn., iig. 1, to receive the pin c,

` `usnallyinserted in thesaw near its end.

` This `pin` enters the recess formed by the rabbet u and the upper face of the follower d, while the ex"- tremity of the saw slides in a groove, o, formed in said follower.

.An opening in the front of the casting A registers with these grooves, so as to admit the saw easily.

For the purpose of conveniently operating follower and clamping-jaws, `I pivot to the former, upon each what:

side, the forked lever or bale l, having a fulcrum in the ange a, as shown in dotted lines Yin fig. 1, and

lever, the saw is tightly clamped by means ofthe spring 1'-, operating upon the jaws `b through the follower d. A y i It will-be seen that the. same center line is preserved for the saw, whatever its thickness, and that vthe device is applicable to any -width of saws.,

My iniprovelnentis of very great convenience in ali fancy, scroll, and bracket sawing, where it is necessary to attach and detach t-hc saw many times every hour, since the operation can be performed almost instantaneously,even when the cross-head is under the table ont of sight.

.It is desirable that the jaws I1. be of hardened steel, file-cutv upon their inner faces, since a pressure upon the back of the saw might otherwise dispiace it.`

The upper side of the rabbet u may be inclined toward the back a, as shown by'dot-ted lines in fig. 1, so that, the tension of the straining-spring will retain it against; Ithe said back. -What I claim as my invention, and desire to securev by Letters Iatent, is#- 1. The wedge-shaped sliding jaws b Aand inclined guides,in combination with the follower d and spring i, .for the purpose herein set forth.

2. The lever l, in combination with thcfollower dy "and jaws b, for the purposes specified.

Y SYLVES'IER G. MASON.

Witnesses J. CHASE, F. H. Gnmmx'r. 

